Carbureter



C. F.1OHNSONL mnm Apr. 19, 1921..

2 YSHEETSLSHEET 1.

Smuwwtom m m M W M N,

orator.

CHESTER F. JOHNSQN, 313 DETROIT, MICHIGAN.

CARBURETER.

Application filed September To all whom it may concern:

Be it known that I, Cnnsrnu F. Joi-INsoN, a citizen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and useful Carburetor, of which the following is a specification.

This invention relates to improvements in carburetors and particularly to carbureters for internal combustion engines. One of the objects of my invention is to provide a simple and effective means for varying the quality of the mixture in said carbureter. Another object is to provide means for positively altering the proportions of fuel and air in said carburetor when it is desired to change the mixture. Another object of my invention is to provide a carburetor having the well known fuel chamber, fuel nozzle and mixing chamber, with means for changing the proportion of fuel and air in a simple and effective manner. In the illustrated embodiment of my invention, it consists, in combination with a float chamber and nozzle leading therefrom, in a diaphragm for dividing the fuel reservoir into two chambers-one in which the float is located, the other, of relatively small size, serving as a confining chamber upon which the pressure of a piston is applicabletogether with a piston and means for causing it to force an extra amount of fuel from the nozzle when desired. It also consists in the details of construction shown, described and particularly pointed out in the subjoined claims.

Referring to the drawings, Figure 1 is a side view, parts being broken away, of a preferred form of carbureter wherein my invention is embodied. Fig. 2 is a plan view thereof. Fig. 3 is a section of the float roservoir and adjacent parts on the line ..3 of Fig. 2.

Similar reference characters refer to like parts throughout the several views.

In the embodiment of my invention shown, 1 indicates carburetor body that forms a mixing chamber and which extended laterally to form a passage for the auxiliary air, this passage being controlled by an auxiliary air valve 3 pivoted at 4 and held upon its seat 5 by a spring 6, these features being substantially the same as those shown in my United States Letters Patent No. 1,095,212, dated May 5th, 1914.

Clamped to the body in any desired man- Specification of Letters Eatent.

Patented Apr. 19, E321.

Serial No. 931 1 1.

ner is a float chamber top 8 (Fig. 8) having a depressed central portion 9; and a diaphragm 10, spaced from the top 8, constitutes a support for the strangle tube 11, the lower end of which dips down into the depression 9, the upper end extending into the mixing chamber. The space between the cover and the diaphragm constitutes a passage for the primary air which enters through one or more openings 12. The depressed central portion of the cover 8 has threaded therein a nozzle 13 that extends downwardly into a float chamber or fuel reservoir 14-, a screw 15 (which passes through the lower wall of the reservoir and is threaded into the lower end of the nozzle) serving to clamp the reservoir and cover together. Fuel is conducted to the reservoir through the pipe 16 (Fig. 1) and a float 17 acting on a valve (not shown) controls the level in the usual way.

The lower wall of the reservoir is continued laterally to form a passage or auxiliary reservoir 20 which, however, is separated from the main portion of the reservoir by a diaphragm or wall 21 that surrounds and is sacred slightly from the lower end of the nozzle 13 to form an annular passage 22; and a passage 18, preferably of greater cross-section than the passage 22, joins the interior of the nozzle to the chamber 20. Through tiese passages fuel may gradually flow from the main portion of the reservoir into the auxiliary portion, and may also flow rapidly in the reverse direction into the nozzle without passing back into the main portion of the reservoir to any great extent. The auxiliary reservoir is extended upwardly in the form of a cylinder 23 and has its upper end closed by a cap .24 and a disk 25 (perforated respectively at 26 and 28) through which passes a piston rod 29, slidable by a close fit through a disk 30 that is interposed between the cap 2 1 and disk 25. Attached to the lower end of the piston rod by ball connection 32 is a piston which may be formed of stamping's 33 and 34;, the latter being spaced from the piston rod to allow free swinging movement.

The piston rec is threaded at its upper end and may be clamped in any desired relation, by means of a screw 36, to the divided end 38 of a link 89, the opposite end of which is pivoted 40 to a crank 11 fixed to the ordinary throttle shaft 1-2. One arm 48 of the crank receives the throttle rod 44, and t0 the end 45 of the latter is attached a tension spring d6, the opposite end of which is preferably secured to the wall of the auxiliary air passage 2 or to any other desired point 428. A lug 50, fixed on the crank ll, and a screw 51, threaded into a third arm of the crank, contact with opposite sides of a lug 52 on the body 1 and limit the throw of the throttle valve in the usual Way.

Operation.

The spring 46 tends to hold the piston 33-3 l elevated. It being desirec to pro vide an unusually rich mixture either for starting or for acceleration, the operator thrusts the throttle rod in such direction, (that is, toward open positionsee Fig. 1) to force the piston downwardly. The dis placed liquid, being unable to escape rapidly through the passage 22, is thereupon discharged upwardly through the nozzle and mixes with the inrushing air. By this construction the mixture is rapidly enriched for acceleration or for otherwise temporarily increasing the power of the engine even when the piston is small and its movement slight.

The details of the device may be modified considera ly without departing from the spirit of the invention, and I do not, therefore, wish to be limited otherwise than as indicated by the subjoined claims.

I claim l. A carburetor comprising in combination, a mixing chamber, a fuel nozzle arranged to discharge fuel into the mixing chamber, a fuel reservoir, a diaphragm dividing the latter into a main portion and an auxiliary portion, said nozzle extending through the main portion and into the auxiliary portion and being in communication with the latter, and a piston arranged to be projected into the auxiliary portion whereby fuel may be rapidly discharged therefrom through the nozzle.

2. A. carbureter comprising in combination, a mixing chamber, a fuel nozzle arranged to discharge fuel into the mixing chamber, a fuel reservoir, a diaphragm dividing the latter into an upper main portion and a lower auxiliary portion, said nozzle extending through the main portion, through an opening in the diaphragm, and into the auxiliary portion, the opening in the diaphragm being of somewhat larger cross section than the nozzle, the nozzle being in communication with the auxiliary portion, and a piston arranged to be projected into the auxiliary portion whereby fuel may be rapidly discharged therefrom through the nozzle.

A carbureter comprising in combination, a mixing chamber, a fuel nozzle arranged to discharge fuel into the mixing chamber, a throttle valve for controlling the flow of mixture through the chamber, a fuel reservoir com nising a main portion and an auxiliary portion separated by a wall, means comprising a valveless port for admitting fuel to the auxiliary portion, said auxiliary portion only being directly connected to the interior of the nozzle, and means arranged to be projected into the auxiliary portion as the throttle valve moves toward open position whereby fuel is expelled into the nozzle.

41. A carburetor comprising in combination a mixing chamber, a fuel nozzle arranged to discharge fuel into the mixing chamber, a throttle valve for controlling the flow of mixture through the chamber, a fuel reservoir comprising a main portion andan auxiliary portion, means comprising a valveless port for admitting fuel from the main portion to the auxiliary portion of the reservoir, means for admitting fuel directly to said nozzle from said auxiliary portion only, said last mentioned means offering less resistance to the flow of fuel than does the means for admitting fuel to the auxiliary portion, and manually, actuated positive means for increasing the flow of fuel to said nozzle as the throttle valve approach s open position.

A. carburcter comprising in combination, a mixing chamber, a fuel nozzle arranged to discharge fuel into the mixing chamber, a fuel reservoir comprising a main portion and an auxiliary portion separated by a wall, means comprising a. valveless port for admitting fuel to the auxiliary portion, said auxiliary portion only being directly connected to the interior of the nozzle, and means, independent of the suction of any engine with which the carbureter may be associated, whereby fuel is expelled from said auxiliary portion into the nozzle.

In testimony whereof I sign this specification.

CHESTER- F. JOHNSON. 

